surreptitious /sur-əp-tishˈəs/

1. Done by stealth or fraud
2. Stealthy

• fuzzes
• fuzzier
• fuzziest
• fuzzily
• fuzziness
• fuzzinesses
• fuzzing
• fuzzle
• fuzzled
• fuzzles
• fuzzling
• fuzzy
• fuzzy-haired
• fuzzy logic
• fuzzy-wuzzy
• fwd
• FX
• fy
• fya
• fyi
• FYI
• fyke
• fykes
• fyle
• fylfot